Subclassing isn't bad but it becomes tedious especially if it's just there to implement something trivial. One of the pain points we had with the
ConnectionRequest API's is the submission body wasn't as convenient as it should be.
One of the frustrating parts in Codename One is builds failing in the cloud, the expectation is that a build that passes locally would pass in the cloud and that is something we strive to have at all times. One of the more commonfailures for new developers is due to refactoring of the main class or changing the signatures of the methods e.g. adding a throws clause to `start()`.Read More
We usually just add a new feature and then tell you about it in these posts but properties is a special case and this post is intended not just as a tutorial but as a solicitation of feedback...
We committed properties as a deprecated API because we aren't sure yet. This could be a very important API moving forward and we want as much peer review as possible over this.
We are launching a partners page in the website that will refer to consultants that we recommend/approve. If you are a software development company that works with Codename One we'd like to feature you in our website and provide the following benefits...Read More
Last week a question came up in stackoverflow that came out quite a few times before but this time I had a better answer thanks to the round border. After giving that answer I recalled that I already wrote some code to implement badging in the FloatingActionButton but never exposed it because of some bugs...Read More
The Phoenix theme had a FloatingActionButton with a gradient on top. This goes against the mostly flat material design spec but after looking at the design with a solid color I came to the conclusion that the designer was totally right to use a gradient in this case. Unfortunately we didn't build that support into the
I explained why we don't support the full Java API (and the difficulties involved) not so long ago. The logic behind this is solid. However, the utility of porting existing Java code to Codename One is also with a lot of merit.Read More
We introduced the new
RoundBorder API a couple of weeks ago and it's already picking some usage. But to really take off it needs to be within the themes, starting with the next plugin update the border section of the designer tool will include the options for round border.
The material design floating action button is a powerful tool for promoting an action within your application. Quite a few Codename One developers implemented with own interpretation of this UI element and with the coming update we will have an official implementation.Read More
Circles and completely round border sides are problematic for multi-resolutions. You need to draw them dynamically and can't use image borders which can't be tiled/cut to fit round designs. Up until now we recommended using background images or changing the design entirely but now we have a new option:
In the coming update we have a new API to expand/collapse an
Accordion component programmatically similar to the
Diamond asked us about an easy way to do dropshadows in Codename One to which I answered that it's pretty easy thanks to our Gaussian blur support...Read More
Starting with the next Friday release we will migrate to the new peer support. This migration will allow us to focus on a single code base and remove the branch where we are maintaining the old peer support.Read More
We finished the final major piece of the offline build offering that we announced in July!
This Sunday we will update the plugins to include this ability as an option. Once installed you can use the instructions below to install the offline build service.
One of our enterprise customers needed help with file upload from the desktop. E.g. in his Codename One app running in the browser or desktop he wanted the ability to drag a file. Somewhat like we can drag a file into gmails compose window.Read More
This is a feature Steve added way back in June but I didn't get around to documenting it. Build hints can sometimes get "unwieldy" e.g. in the case of
we sometimes have pretty verbose values.
When we initially designed the cn1lib file format we looked at jar files as a starting point. We wanted a way to distribute binary libraries that support the native code access, restrictions and ideally code completion.Read More
When we announced Codename One 3.4 we also announced a major animation overhaul. This was an important milestone that we didn't fully actualize until this past week...Read More
I wanted to write about the new kitchen sink demo which I'm trying to finish...
But I haven't finished it yet as it's such a major undertaking. As part of that work I wanted to show some code that downloads themes and didn't want to use the venerable infinite progress indicator which I generally dislike...
It's tough to pick up a new toolchain like Codename One. There's so much to learn...
A lot of our developers come from the Android world and even though Codename One is much simpler than Android porting the first app to Codename One is still painful.
When we get a crash report one of our first questions is "when did you build this?".
The answer is often too vague to trace the specific version, so we end up with a mixture of guessing.
The main issue is that there are different version values. They conflict with one another. They can be confusing and they can be inaccurate.
One of the big decisions we made a while back was to build the new GUI builder on top of Codename One itself, we extended that decision three months ago with the decision to build the Codename One settings in Codename One and then deciding to make it the default preferences UI for all IDE's...Read More
We had a couple of posts in the past about the new GUI builder but we didn't have a "how to" guide yet. In this post we'll try to go step by step over the process of using the GUI builder and understanding its inner workings. We'll also try to clarify conclusively the role the new GUI builder plays in the toolchain and the migrations process from the old GUI builder.Read More
As we mentioned recently we have a new idea on how peering can be improved and we just deployed a this into our build servers in the weekend update. This is highly experimental and might crash instantly which is why we hope you give it a test drive and see how it feels before we switch it on by default.Read More
A common issue we get from developers relates to minor differences between devices which are often very hard to quantify. They are also very hard to explain to the developers in some occasions. One of the biggest points of difficulty is density which is a very hard concept to grasp and it's often hard to know which image will be used from the set of multi images or how many pixels will be used for 1 millimeter.Read More
ToastBar was one of those API's I didn't know I needed and yet I became addicted to it...
Ever since Steve came out with the
ToastBar I constantly catch myself typing
Display.show only to delete that to use the
ToastBar. It's both really easy to use and more consistent with modern mobile UI design.
InfiniteScrollAdapter revolutionized the way we think about Codename One. Up until their introduction we advocated lists for large sets of components and this is no longer the case.
InfiniteContainer has a controversial feature even within out team. It violates the EDT on purpose...
We covered the new
Accordion component last week and just started using it in a demo for which it was very suitable. As we were working with it we discovered that it was missing some core methods to remove an
Accordion entry or change it's title. But worse, was the fact that a delete button in the title wouldn't work!
The crux of the issue is in the fact that lead component doesn't support excluding a specific component within the hierarchy from it's behavior so we set about to fix that...
Background fetch allows an app to periodically "fetch" information from the network while the app is in the background. This is scheduled by the native platform, where apps that support background fetch will be started up (in the background), and their
performBackgroundFetch method will be invoked.
Accordion ui pattern is a vertically stacked list of items. Each item can be opened/closed to reveal more content similarly to a
Tree however unlike the
Accordion is designed to include containers or arbitrary components rather than model based data.
Toolbar is a pretty flexible API for handling the title area. It allows a lot of things including search but up until now that very common use case was not a standard part of the API.
After many months of work and effort put in by all of us but especially by Steve Hannah and Fabrício Carvalho Cabeça we are finally live with the Windows Universal Platform (AKA UWP) native build target!
As far as I know Codename One is the only native option for Java developers to build native Windows UWP apps.
Managing your project dependencies and 3rd party extensions among the hard to navigate list of cn1libs has always been challenging. We are now tackling this problem in the new settings UI which is scheduled to launch for all IDE's this Friday.Read More
With the upcoming library update this weekend we will remove the venerable (old) skins that are baked into the simulator. This means that they will no longer be immediately accessible but you can still download all of them thru the Skins -> More menu option.Read More
While the Codename One skin file format is trivial it is a bit under documented, to partially alleviate this problem we created a simple tool: Skin Designer.
This tool allows us to create a device skin from two images (landscape & portrait). This skin file can then be used with the Codename One simulator & also contributed so other developers can enjoy it!
Bluetooth is one of those specs that makes me take a step back... It's nuanced, complex and multi-layered. That isn't necessarily bad, it solves a remarkably hard problem. Unfortunately when people say the words "bluetooth support" it's rare to find two people who actually mean the same thing!Read More
CocoaPods is a dependency manager for Swift and Objective-C Cocoa projects. It has over eighteen thousand libraries and can help you scale your projects elegantly. Cocoapods can be used in your Codename One project to include native iOS libraries without having to go through the hassle of bundling the actual library into your project. Rather than bundling .h and .a files in your ios/native directory, you can specify which "pods" your app uses via the
ios.pods build hint. (There are other build hints also if you need more advanced features).
Starting with the new version of the NetBeans plugin we will have the new settings/preferences UI which we introduced in the IntelliJ/IDEA plugin. Currently this will be in addition to the main preferences but as we move forward we will only add features to the new settings UI.Read More
One of our support emails drew my attention to a glaring ommission in our icon font support...
When we create an icon for a `Button` it's color matches the unselected color of the button which might not look as attractive when the `Buton` is selected or pressed!
One of the often requested features in Codename One is zip support, we had some issues with it until a couple of years back we added tar and later gzip support. But people still asked for standard zip file support which was missing.
When we initially launched Codename One it was pretty hard to imagine todays apps. Menus and back navigation were miles apart when comparing Android 2.x and iOS 4.x... So we created a very elaborate set of abstractions (command behavior) that served as a set of patch framework we could live with for a while.Read More
We talked about the new Android 6 (Marshmallow) permissions in Codename One last week and so far we've been pretty happy with the result. We had some build regressions on the older Ant based build path but those were fixed shortly after and it's been smooth sailing since then. As part of the transition to the new permissions system we added two features to the simulator and the
As part of our continuing effort to squash bugs for the 3.4 release date we hit two major issues, the first of which is a long time RFE to fix PDF viewing on iOS and Android to work consistently. This also applies to any file opening in iOS/Android which should now be trivial with the
Display.execute method. Just use that method on any file within your home directory in
FileSystemStorage and it should launch the native app to view that file.
As part of the bug fixes for the 3.4 release we fixed issue 1725 which was surprisingly difficult to fix... As part of that fix we also added a new method to
TextArea by the name of
setActAsLabel which we now implicitly call in the
One of the hard things to debug in Codename One is UIID/Padding/Margin placement which is often tricky to get "just right". I use the Component Inspector quite a lot to review a layout that misbehaves and gain further insight into what's happening in runtime.Read More
In our original Java 8 support announcement post we specifically mentioned the lack of streams but completely missed the fact that default/static native interfaces didn't work. This is now fixed thanks to an alert community member who pointed that out.Read More
Our current IntelliJ/IDEA plugin is seriously behind the times. In our recent survey it was very easy to spot IDEA developers who were significantly less satisfied with Codename One than the rest of the developer community.The IDEA plugin doesn't include basic capabilities such as...Read More
Clipping is one of the core tenants of graphics programming, you define the boundaries for drawing and when you exceed said boundaries things aren't drawn. Shaped clipping allows us to clip based on any arbitrary shape and not just a rectangle, this allows some unique effects generated in runtime.Read More
Starting with the next update of Codename One (later this week) we will switch
Toolbar on as the default for all newly created projects. This doesn't mean much for most of us as existing projects won't be affected, however if you are creating a new project this means you won't need to create a
Toolbar for every
Form and that we won't have to deal with as many issues related to the native Android title.
I was working on documenting the SQLite support in Codename One, you can see some of that work both in the db package and in the developer guide. As a demo for SQL I decided to just create a tool that allows you to type arbitrary SQL to execute it on the device and see the results in a
Beside being a cool example this can be a hugely powerful debugging tool to one of the more painful API's to debug on the device. You can integrate this as a hidden feature into your application and use it to debug odd "on device" issues by querying the DB!
We've had a busy week working with several customers on various tasks/issues as well as the documentation which is practically unrecognizable by now (more than 600 pages by now). As a result a lot of small fixes and enhancements were made to the code as well as one new niche component.Read More
A very common UI pattern is the 5 star ranking system. Up until recently we always had the same answer when developers asked us how to implement it: "Use toggle buttons (CheckBox)".
This is still not a bad answer but we think there is a "better" simpler way to do this thru the
Slider which was effectively designed with this usage in mind.
Just last week I wrote that we are making an effort not to add new features and we got foiled by a couple of new features. The main reason for this is paying customers who need to have a feature now. This makes it hard for us to focus completely, but it does keep the lights on here so we can't really complain.
To be fair, during this time we were able to almost double the page count of the developer guide from the 3.2 era to 576 pages at this moment and we still have a lot of work ahead of us in that department.
As you know we've been working a lot on the docs both the developer guide and the JavaDoc's, we nearly doubled the amount pages in the developer guide and we did it without "cheating" (e.g. cramming more stuff, increasing font size). You can see all that work in the developer guide section but what I want to discuss today is the new Component Gallery and Layout Gallery.Read More
I've been remarkably busy working on issues and documentation so I neglected an important announcement I had to make. Over the weekend we flipped the default build from gradle back to ant. So effectively if you don't set any build hint the behavior will be
android.gradle false which should work fine for most of you. This is temporary but we felt it was necessary as a stopgap measure.
Facebook recently announced the closing of parse.com which is disappointing but not totally surprising. Everyone knows a project from a large tech company can just shutdown in a blink of an eye leaving millions of users/developers in limbo. In that sense one of the questions that gets under my skin is what happens if Codename One calls it quits...Read More
JavaDoc source code embeds suck!
I love JavaDoc but it didn't age well. When you work with other tools (e.g. in the Microsoft world) suddenly the embedded samples look amazing and "search" functionality is just built in!
Why can't we have that?
JDK 9 is introducing new support for search but source embeds can be so much better and are a crucial learning tool...
Following with the feedback on the recent survey we spent a lot of time debating how we can improve the general process of documentation and ideally have the community more involved. So one of the first things we did is place our entire developer guide directly into the Codename One Wiki!
This allows any one of you without any special permissions (just a standard github account) to edit the wiki directly. No pull request or anything like that required. The syntax is based on asciidoc which is reasonably intuitive so if you see something wrong/missing etc. just edit it directly, we review all changes after the fact so if you get something wrong we will fix it!
Steve has implemented one of our long time RFE's: Async editing in Android. This effectively means that the Android keyboard will behave as it does in iOS and won't fold/open as you move between text fields. It will also remain open as you scroll the screen and won't resize the UI as it opens!
As you can imagine this is a huge change so it is currently off by default but we will flip the change sometime next week to be the default.
We committed a major somewhat revolutionary change to how layout animations and the basic component tree work in Codename One. This is important to understand since it changes the very nature of how we expect components to behave in Codename One. This also allows us to create some pretty spectacular effects such as the ones in the title above.Read More
After a discussion with some members of the community we decided to shift the weight of our support efforts to StackOverflow from our existing google group discussion forum. Notice that we will still answer questions in the discussion forum but we strongly prefer using StackOverflow (don't forget to use the codenameone tag).
There are issues with StackOverflow which is why we are keeping the existing group and will still answer questions/issues there but the benefits far outweigh the issues:
Sizing images for multiple DPIs and device sizes is challenging. There are image quality and bandwidth considerations, especially when loading images over the network. The new Cloudinary cn1lib simplifies this process by preprocessing images on the server side, so that they can be delivered to the mobile app in the exact correct side and quality.Read More
We became infatuated with icon fonts a while back and used them quite a bit, recently we added the FontImage class that made them really easy to use.
However, up until now you had to download a font. Look up the value and enter it in. This was OK but not ideal in terms of syntax/availability especially for simpler apps.
I've spent a lot of time working with and reviewing other cross platform tools this past month, mostly with Cordova due to our recent announcement that we support Cordova.
I hope it doesn't come off as too arrogant but our "onboarding" experience is pretty amazing in comparison to pretty much everything else. Just install IDE, type in Codename One and follow wizard for new app. The only tools that are simpler than that are the rather limited web based solutions.
But we do fall short in one major way, our "hello world" apps look bad by default when compared to pretty much any tool out there. There are a lot of reasons for this but none of them are good reasons and this gives a horrible first impression to any developer picking up Codename One for the first time.
We just released the first version of the open source CN1Cordova project on github. This means you can take a common Cordova/PhoneGap app, import it into NetBeans and build a native app using our cloud build servers without any changes!
Before we delve into the exact process of converting an app lets start by reviewing the exact benefits PhoneGap/Cordova developers can gain from Codename One. You can also check out the video tutorial and slides below.
A common trick for animating Components in Codename One is to set their preferred size to 0 and then invoke
animateLayout() thus triggering an animation to hide said component. There are several issues with this trick but one of the biggest ones is the fact that
setPreferredSize has been deprecated for quite a while.
We've been working on some pretty exciting things recently trying to get them out of the door. As part of that work we added some API's specifically one that probably should have been a part of Codename One 1.0
Properties file support...
In this last minute before 3.2 finally comes out we have a batch of new features & updates. Some of the last minute features that went into Codename One include: shorter more terse syntax for creating forms, migration wizard for the new GUI builder & dialog adaptive sizing.Read More
The new Codename One CSS library enables you to create entire themes using only CSS, but in this post, I’m going to focus on its ability to automatically generate image backgrounds and borders for your apps.Read More
Since we announced the new GUI builder work we got quite a few questions in the discussion forum and offline so I prepared a quick video showing how the new GUI builder will look when released (more or less). Notice that a lot of things will change with the GUI builder but some things are pretty much fixed such as the basic architecture with the XML to Java process. This is unlikely to change much.Read More
This is the third and final instalment in a series on integrating 3rd party native SDKs in your Codename One application. If you missed the first two chapters, I recommend you begin with part one before reading this tutorial, as it provides much needed context for the procedures described here.Read More
This blog post is part two in a three-part series on integrating 3rd party native SDKs into Codename One application. I recommend you start with part one in this series as it will give you much-needed context to understand the procedures described in part two and three.Read More
We are happy to announce support for local notifications on iOS and Android. Local notifications are similar to push notifications, except that they are initiated locally by the app, rather than remotely. They are useful for communicating information to the user while the app is running in the background, since they manifest themselves as pop-up notifications on supported devices.Read More
This past Thursday, we held our fourth webinar, and the topic was how to incorporate 3rd party native libraries into a Codename One app. I used the recently released FreshDesk cn1lib as a case study for this webinar. As the topic is a little involved, I decided to break it up into two webinars. In part one, we focused on the public API and architecture involved in developing a wrapper for a native SDK, and walked through the native implementation for Android.Read More
Codename One provides extensive support for designing beautiful user interfaces, but it isn't necessarily obvious to new developers how to achieve their desired results. A common workflow for app design includes a PSD file with mock-ups of the UI, created by a professional designer.Read More
We've been so busy recently that changes and features keep piling up with no end...
It was always possible to create a permanent side menu but up until now it wasn't trivial. For Tablets/Desktops the side menu UI is perfect, but the folding aspect of it isn't as great. We have more space so we'd like to keep it open all the time.Read More
A couple of weeks ago I created a simple social network app as part of the Codename One webinar. This app provided functionality similar to the Facebook app.Read More
We are starting the complete overhaul of our push implementation that will allow us to deliver improved push related fixes/features and provide more reliability to the push service. When we designed our push offering initially it was focused around the limitations of Google App Engine which we are finally phasing out. The new servers are no longer constrained by this can scale far more easily and efficiently for all requirements.Read More
On Thursday morning we rolled the cameras for chapter 2 of our exciting new webinar series. This time around there were far fewer (though not zero) technical issues, and we were able to share a productive hour of mobile app development in the company of our fellow coders.Read More
We decided to discontinue support for building without a certificate, this support was added initially because generating an iOS certificate was so difficult and we wanted developers to see that "it works" before committing to the expense. However, this process is wrought with bugs that are often hard to trace back and error prone. Added to that is the fact that we now have the new certificate wizard which makes the process simpler thus removing the final blocker (no need for a Mac).
We will block this functionality in the build servers by next week and thru the plugin after that.
When StartApp first launched a few years ago, they were a unique innovative new monetization channel to make money on Android.Read More
Tuesday morning I held a webinar on Java mobile development using Codename One. First of all, I'd like to thank all who signed up and attended. Unfortunately there were some technical difficulties with the Webinar software that caused some major glitches. Double thanks to those who endured and stayed to the end. We've learned from this experience and we will do better in future webinars.Read More
Codename One already has two separate socket APIs: a low-level API similar to java.net.Socket and a higher-level event-based approach. So why do we need WebSockets?Read More
We've released a burst of small new features that piled up during the code freeze and release cycle. The first one is the Facebook "invite friends" feature. Historically with the Facebook API you could just use the Graph API to query Facebook for the list of friends. This will return an empty list now and will only expose friends who are already using the app. You can use the standard share button or Facebook share both of which are great options to promote your app. However, Facebook also has a special native API allowing the user to invite his friends into the app...Read More
Its been a busy month and getting busier by the moment, we are preparing for App Engines suspension of its blobstore service which will be coming around soon. This effectively means older crash report email functionality will be stopped for older apps (just rebuild the app for the emails to work again).
We are also getting ready for Codename One 3.1 which we have tentatively scheduled for July 27th. This release will include a weeks worth of code freeze and will be the first of our new policy for faster release schedules.
So you have finished your app and tested it on the simulator. Everything looks good. You're now ready to proceed with testing on your iPhone. You select the "Send iOS Debug Build" menu item and wait for the build server to work its magic, but then you're faced with a notice that iOS builds require a valid certificate and provisioning profile. What a hassle!Read More
When we introduced Codename One initially we limited the API to CLDC level which is roughly a subset of Java 1.3, we then added support for a subset of Java 5 and we are now adding Java 8 language features!
Thanks to some work from Steve and the great work done by the guys from the Retro Lambda project we were able to add compatibility to the major Java 8 features, most notably lambda expressions. This is highly experimental and some features might not work but so far it seems things are functioning rather smoothly.
While multi-image's go a long way in making your app scalable to various devices, scalable images can be even more convenient. The SVG standard never took off though, its too complex to support in an efficient way on the devices and so its relegated to web applications and even those don't make heavy use of it due to its complexity.
However, icon fonts have gained a lot of popularity in recent years and we used them in the past in Codename One e.g. in the photo demo.
Chen recently published a major refactoring of our connection framework which up until now only supported Facebook login. With this recent refactoring the code to connect to various authentication services becomes far simpler and various services should become more pluggable. The default implementation centers around the
LoginCallback classes that use oAuth by default to perform the login.
With the release of 3.0 we were overwhelmed with a lot of last minute features and improvements. It seems that we neglected to mention a lot of features that made it into the final 3.0 product.
One of the nicest new features is a set of new flat themes with various colors in the designer and the project wizard. We found that a lot of developers prefer themes with more control over the look, themes that look more similar across platform yet have a more modern "flat" feel.
Devices have sensors such as accelerometer, GPS and up until now our support for them was relatively basic.
Chen recently introduced a cn1lib that includes support for various types of sensors on the device. Check it out if you need support for such API's.
When Codename One packages applications into native apps we hide a lot of details to make the process simpler. One of the things we had an issue with is
getResource/getResourceAsStream both of which are problematic since they support hierarchies and a concept of package relativity.
That's a concept that is problematic in iOS, generally everything about file access within the bundle in iOS is a bit problematic to accomplish in a cross platform way because Apple tries so hard to "simplify" and ends up creating fragmentation for us.
Up until recently we had to handcode validation logic into every form, this becomes tedious as we work thru larger applications. Some developers built their own generic logic, which leads to obvious duplication of effort. In the interest of keeping everything together we decided to release a standardized validation framework that allows us to define constraints on a set of components, mark invalid entries and disable submission buttons.Read More
As part of tracking a bug in iOS media playback Steve hit upon some code that recreated the OpenGL framebuffer pretty much all the time. This was there to allow device rotation to work, but was implemented incorrectly...
After this fix animations and UI is much smoother on iOS, if you notice any potential issues let us know.
Using Codename One's new graphics pipeline it is now possible to start playing with other cool visualization technologies like GeoJSON.Read More
Now that the new website is live we are down to standard business again beyond just the typical bug fixes. Chen just updated the gallery support to include the ability to pick a video file and not just an image file...Read More
One of the pains in Codename One is the access to the demos, yes we have the downloadable demo bundle and the SVN but for a compete novice to Codename One this isn't front and center. Chen decided to address that by embedding the latest versions of the demos both into the Eclipse and the NetBeans plugins, now when you create a new Codename One project you can also create a demo project and "just run it". This allows you to quickly learn/debug our sample code which should help with the Codename One learning curve.Read More